Littelfuse Q Series Switching Thyristors

Standard Triacs are bidirectional AC switches designed to handle loads from 0.8A to 35Arms with 10mA, 25 mA, and 50mA I GT in operating Quadrants I, II and III. Standard Triacs are used in full-wave AC applications to control AC power either through full-cycle switching or phase control of current to the load element. The glass-passivated junctions enable long-term device reliability and parameter stability. Ideal for motor speed, heater, and incandescent light controls.

Alternistor Triacs provide the highest commutation performance in applications with highly inductive loads. Alternistor Triacs operate in Quadrants I, II, and III, and are used in circuits requiring high dv/dt capability. Load capabilities range from 6A to 40A with blocking voltage rating from 200V to 1000V. The construction of the Littelfuse Alternistor Triacs offers the same performance as two thyristors (SCRs) wired inverse parallel (back-to-back). This design provides the equivalent of two electrically separate SCR structures with enhanced dv/dt characteristics while retaining the advantages of a single-chip device.